SHIMANO RD-M780L XT Rear Derailleur 10 Speed New 10-speed system design for consistent shift effort through all positions Advanced Light Action provides smooth & effortless shifting for long term riding Shimano Shadow low profile design improves clearance Low profile shorter cage reduces chain bounce and improves ground clearance GS (mid cage) Total capacity: 35T Max low sprocket: 36T Min top sprocket: 11T 230 grams